. >> reporter: there are also several big technology companies that investors hope will go public. one is twitter. although many i.p.o. experts don't think that will happen this year. another possibility is square--a mobile payments company founded by the man who created twitter. and, finally dropbox, a web- based file hosting service. but, it's understandable that many companies are approaching the i.p.o. market cautiously. they're wary of becoming the next facebook with a stock price that's still well below may's offering price. erika miller, "n.b.r.," new york. >> susie: it took a long time for norwegian cruise lines to make the big decision to go public. since the 1990's, it attempted several times to do an i.p.o., but pulled back. when i talked with c.e.o. kevin sheehan today, i asked him why he felt that the time was finally right. >> it's always a lot of pluses and minuses of being a public company, as you know, but at some point, we needed to take this step. and we thought this was the perfect time, you know, washington resolved its situation, and now we move into the new y